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Old 02-22-2013, 12:19 PM   #6
lddavis
Focus Enthusiast
 
Join Date: Sep 2012
Fan#: 104180
Location: Petaluma, CA
What I Drive: 1997 Red Outback

Posts: 180
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According to the owner's manual (including the ST supplement), no break-in period is required.

I find it hard to break old habits, so despite the manual, for the first 1000 miles, I do the normal break-in thing:
- vary the RPM (not necessarily "speed"; if you're on the highway, move between upper gears occasionally to vary RPM even if you're stuck at 65 mph)
- avoid high RPM at first (hard as that is with an ST :)) and only gradually increase the upper bound
- make sure the engine sees at least some instances of high pressure (open throttle in a higher gear will do this without necessarily causing a lot of acceleration, RPM, or speed)
- make sure to decelerate under vacuum as well (leave the car in gear and take your foot off the gas when approaching a stop, etc).

Change the oil and filter after 1000 miles.
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